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authorDave Chinner <dchinner@redhat.com>2012-04-24 08:33:31 +0200
committerBen Myers <bpm@sgi.com>2012-05-21 17:45:44 +0200
commit14c26c6a05de138a4fd9a0c05ff8e7435a618324 (patch)
treec916866e4e9ac21d5f3400edf3eb8186ea7740af /fs/xfs/xfs_log.c
parentxfs: fix memory reclaim deadlock on agi buffer (diff)
downloadlinux-14c26c6a05de138a4fd9a0c05ff8e7435a618324.tar.xz
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xfs: add trace points for log forces
To enable easy tracing of the location of log forces and the frequency of them via perf, add a pair of trace points to the log force functions. This will help debug where excessive log forces are being issued from by simple perf commands like: # ~/perf/perf top -e xfs:xfs_log_force -G -U Which gives this sort of output: Events: 141 xfs:xfs_log_force - 100.00% [kernel] [k] xfs_log_force - xfs_log_force 87.04% xfsaild kthread kernel_thread_helper - 12.87% xfs_buf_lock _xfs_buf_find xfs_buf_get xfs_trans_get_buf xfs_da_do_buf xfs_da_get_buf xfs_dir2_data_init xfs_dir2_leaf_addname xfs_dir_createname xfs_create xfs_vn_mknod xfs_vn_create vfs_create do_last.isra.41 path_openat do_filp_open do_sys_open sys_open system_call_fastpath Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Mark Tinguely <tinguely@sgi.com> Signed-off-by: Ben Myers <bpm@sig.com>
Diffstat (limited to 'fs/xfs/xfs_log.c')
-rw-r--r--fs/xfs/xfs_log.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 9b10a15295a2..6b965bf450e4 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -2941,6 +2941,7 @@ xfs_log_force(
{
int error;
+ trace_xfs_log_force(mp, 0);
error = _xfs_log_force(mp, flags, NULL);
if (error)
xfs_warn(mp, "%s: error %d returned.", __func__, error);
@@ -3089,6 +3090,7 @@ xfs_log_force_lsn(
{
int error;
+ trace_xfs_log_force(mp, lsn);
error = _xfs_log_force_lsn(mp, lsn, flags, NULL);
if (error)
xfs_warn(mp, "%s: error %d returned.", __func__, error);